https://www.nbcnews.com/politics/donald-trump/ballroom-trump-renovating-white-house-gold-oval-office-rose-garden-rcna221937
Necessary?
"Trump estimated that taking down the East Wing and putting the ballroom in place would cost about $200 million. The East Wing was completed in 1942 under Franklin D. Roosevelt's administration, according to the White House Historical Association..."
